Kazushi Yamamoto

Anti-aging effects of high molecular weight proteoglycan from salmon nasal cartilage in hairless mice

Proteoglycans comprise a family of complex macromolecules consisting of a core protein with covalently attached glycosaminoglycan (GAG) chains. The skin anti-aging effects of oral administration of proteoglycan fractions with different molecular weights from salmon nasal cartilage were investigated in a hairless mouse model of skin aging; aging was caused by repeated ultraviolet B (UVB) irradiation. Three proteoglycan fractions of different molecular weights were prepared from salmon nasal cartilage water extract by ion-exchange column chromatography and gel filtration column chromatography. Physiological and histological analysis of the skin indicated that oral administration of high molecular weight proteoglycan inhibited UVB-induced skin aging, defined as increased erythema, increased transepidermal water loss (TEWL), decreased hydration, and epidermal and dermal hypertrophies. The serum and dorsal skin inflammatory cytokine levels indicated that high molecular weight proteoglycan acts on gut immunity and improves skin by inhibiting surplus inflammatory cytokines produced by UVB irradiation. These results suggest that high molecular weight proteoglycan from salmon nasal cartilage is effective in preventing skin aging.

Anti-aging effects of extracts prepared from salmon nasal cartilage in hairless mice

The skin anti-aging effects of orally administered salmon nasal cartilage extract (SNCE), which includes abundant proteoglycan, were investigated using a hairless mouse skin-aging model, in which aging was caused by repetitive ultraviolet B (UV-B) irradiation. Physiological analysis of the skin surface following repetitive UV-B irradiation of 8xa0weeks revealed inhibition of erythema levels and reduction of transepidermal water loss (TEWL) due to oral administration of SNCE. Similarly, inhibitory actions of epidermal and dermal hypertrophy were revealed by hematoxylin and eosin staining. Furthermore, effects on the hydration level of the skin surface by SNCE administration were indicated at 4xa0weeks of UV-B irradiation, but greater effects were not apparent. These results indicate that SNCE may serve as an anti-aging agent for healthy skin.